Flame retardant

DATE：2021/12/14 8:37:44 / READ： / SOURCE：This station

Flame retardant

       Most plastics are combustible. Plastics are widely used in construction, steam, machinery, ships, electrical appliances, furniture and daily necessities, but they all need to be combustible to ensure safe use and prevent fires. The role of flame retardants is to increase the flame resistance of high objects. The flame retardant methods are as follows:
      ① After the flame retardant is decomposed, heavier non-combustible gas or high-boiling liquid is produced on the surface of the plastic to isolate or reduce the penetration of oxygen to prevent combustion.
      ② Coat a layer of flame retardant on the plastic surface to prevent it from burning due to oxygen.
      ③Add a flame retardant that can capture free radicals to interrupt the oxidation reaction and prevent combustion from occurring or continuing.
      The main varieties of flame retardants are as follows.
      ① Chlorine-containing compounds, such as chlorinated paraffin with 70% chlorine, are mostly used in polyethylene and polystyrene.
      ② Bromine-containing compounds, such as decabromodibenzene, tetrabromophthalic acid, are mostly used in polystyrene, polyolefin, ABS, epoxy resin, etc.
      ③ Phosphorus-containing compounds, such as trichloroacetyl phosphoric acid, are mostly used in polyvinyl chloride, polyester, phenolic resin, etc.
      ④ Antimony-containing compounds, such as trioxide, are mostly used in polyvinyl chloride and polyolefins.

      The necessary conditions for flame retardants are as follows.

      ①Do not reduce the physical properties of the polymer, such as heat resistance, mechanical strength, electrical properties
      ②The decomposition temperature should not be too high, but it cannot be decomposed at the processing temperature
      ③Good durability and weather resistance
      ④The price is low.

Author：admin

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